Virtual Environment in Python

Virtual Environment in Python — a practical guide to Python virtualenv venv with clear examples you can reuse in real projects.

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Short description

Always create a virtual environment per project. Activate it before installing packages.

Steps

1. Create .venv with python -m venv.
2. Activate the environment.
3. Install packages inside it only.

Create and activate venv

python -m venv .venv
# Windows PowerShell:
.venvScriptsActivate.ps1
# macOS/Linux:
# source .venv/bin/activate
pip install flask